Safety device for elevators.



B. & G. E. BAUMER.

.SAFETY DEVICE FOR ELEVATORS.

APPLICATION FILED APILZE, 1012.

1,055,252, PatentedMarA, 1913.

2 SHEETS-SHEET 1.

WITNESSES Q2 5 INVENTORS W a- 44' CLARENCE E BAUNER V BA u M ER hrAltpme B. & O. E. BAUMER.

SAFETY DEVIUE FOR ELEVATORS.

APPLICATION FILED APB..25, 1912.

1,055,252, Patented Mar. 4, 1913.

2 SHEETS-SHEET 2.

WITNESSES INVENTORS W CLARENCE E BAUMER X B Ewrm A B m: MER r M v heQvAllarm' UNITED STATES PATENT OFFICE.

BERTHA BAUMER, OF ATLANTA, GEORGIA, AND CLARENCE E. BAUMER, OF TROY,OHIO.

SAFETY DEVICE FOR ELEVATORS.

To all whom it may conccrn x' Be it known that we, BERTIIA Barnum andCLARENCE E. Barnum, citizens of the United States, the said Bnn'rlnBarnum: residing at Atlanta, county of Fulton, and State of Georgia, andthe said CLARENCE E. BAUMER residing at Troy, in the county of Miami andState of Ohio, have invented certain new and useful Improvements inSafety Devices for Elevators, of which the following is a specification,reference being had therein to the accompanying drawing. 4

This invention relates to safety devices for elevators and has specialreference to a safety device of improved character wherein the cableused to hoist the elevator is also used as a conductor for electriccurrent, which, upon being interrupted by the breakage of the cablepermits the safety device to be thrown into action.

The principal object of the invention is to improve and simplify thegeneral construction of devices of this character.

A second object of the invention is to provide a novel form of safetydevice wherein an air cushioning apparatus is used to gradually checkthe speed of the car. A third object of the invention is to providemeans whereby a car running away either in ascent or descent will bechecked by the automatic application of an improved safety device.

With the above and other objects in view, this invention consists ingeneral of certain novel constructions, combinations and arrangements ofparts, as will be hereinafter fully described, illustrated in theaccompanying drawings, and specifically claimed.

In the accompanying drawings, like characters of reference indicate likeparts in the several views, and Figure 1 is a section through anelevator well showing an elevator equipped with the safety device. Fig.2 is a bottom plan view of an elevator car with the safety device inposition. Fig. 3 is an enlarged detailed section on line 33 of Fig. 2.Fig. 4 is a section On line t -t of Fig. 2. Fig. 5 is a diagrammaticview showing the wiring arrangement.

In the embodiment of the invention herein shown there is provided anelevator shaft 10 having a car 11 moving therein and supported by acable 12. This cable 12 is electrically connected to a suitable sourceof electricity, as the generator 13, and in the Specification of LettersPatent.

Application filed April 25, 1912.

Patented Mar. 4, 1913.

Serial No. 693,204.

elevator shaft are guides 14: which are likewise connected to thegenerator 13.

Extending transverse the bottom of the car is a crank shaft 15 and oneach end of said shaft 15 is mounted a toothed wheel 16 which mesheswith a rack bar 17 carried by the respective elevator guide andextending from top to bottom of the well.

Diagonally disposed on the bottom of the car are two cylinders 18 andthese cylinders are located on opposite sides of the bottom of theelevator car. Each of these cylinders is provided with the usual pistonand has a rod 19 connected by a link 20 with a crank 21 on the shaft 15,said cranks 21 being arranged at an angle of 180.

Suitably positioned on the bottom of the car are valves 22, the casingswhereof are connected by pipes 23 with the ends of the respectivecylinders 18. These valves are controlled by levers 21 all connected toa bar 25 actuated by a lever 26 projecting upward through an opening 27in the bottom of the car so that the valves may be controlled manuallyby the operator.

At each end of the shaft 15 are certain controlling devices which willnow be described.

On the shaft 15 is splined a sleeve 28 while secured to the gear 16 is arecessed clutch member 29 which is adapted to be engaged by a clutchmember 30 splined upon the sleeve 28. The clutch member 30 is formedwith a projection having an annular groove 31 in which is mounted thearms of a fork 32 carried on one end of a lever 33 pivoted intermediateits ends beneath the floor of the elevator car.

Extending up through the elevator car is an operating lever 34, to thelower end of which is connected a rod 35 and one of the levers 33 hasits end connected to this rod 35 while the other lever 33 is shorter andhas a pin and slot connection With a lever 36 the remaining end of whichis connected to said rod 35. By means of this construc tion the lever 34may be used to throw the clutches in and out of engagement. Theprojection of the head 30 is formed with a second annular groove 37having an annular socket 38 in which is located one end of a coil spring39, said spring encircling the sleeve 28. The other end of said spring39 bears against the disk 40 slidable longitudinally on the sleeve 28and splined thereto.

This disk 40 is provided on its periphery with clutching pawls 41pivoted thereto and each having a rear curved portion 42 bearing againsta curved recess 43 in a disk 44 splined upon the sleeve 11, theforwardly projecting ends of the pawls 41 normally engaging the groove37 in the projection of the clutch 30, thus holding said clutch out ofengagement with the head 29. In this position the rear projectingportion 42 of each pawl 41 is forced outward by means of a compressionspring 46. These clutching pawls 41 are released from engagement withthe clutch 80 by means of a fork 47 located in an annular groove 48 inthe disk 44, said fork 47 being on the end of a double arm lever 50pivotally connected at its other end to a slidable contact bar 51through the medium of a bell crank lever 51 normally held against thearmature of a magnet 52 mounted on the bottom of the car. The disk 44has projecting therefrom a socket member 54 in which is located aslidable member 55 mounted on the sleeve 28. This slidable member 55 isprovided with lugs 56 projecting through slots in the member 54 andpivoted to these lugs are levers 57 having ends 58 which bear againstthe member 54, and these levers carry governor balls 59 on their outerends.

Gears 16 are mounted. on sleeves at each end of the shaft 14 and thesegears mesh with the respective rack bars 17 carried by the guides 14.The clutch members 29 are connected to these last-mentioned sleeves torevolve therewith.

Suitably mounted on the bottom of the car are brackets 61 and betweenthese brackets 61 and the bar 51 are springs 62 which normally urge saidbar away from the magnet. This magnet is connected at one end by a wire63 with the shaft 15 while the other end of the magnet is connected by awire 64 wit-h the hoisting cable 12.

In the operation of the device if it is desired to set the clutches byhand the lever 34 is operated as previously described. If the cablebreaks, current through the magnet will be interrupted and the springs62 will come into action thus causing the levers 50 to move the members44 out-ward and this in turn operates the levers 42, thus releasing theclutch member and permitting the action of the spring 39. In likemanner, if the elevator runs away, the levers 57 operate to move saidpart 44 outward and cause the release of the clutch member. In any eventthis immediately throws into action the cylinders 18 and the car is thuspneumatically checked in its descent.

There has thus been provided a simple and efficient device of the kinddescribed,

and for the purpose specified.

Having thus described the invention, what is claimed as new, is:

1. In a safety apparatus for elevator cars, an elevator car, a well,rack bars extending fromtop to bottom of the elevator Well on each sidethereof, a shaft mounted on the bottom of said elevator car, a toothedwheel on each side of said elevator car meshing with a rack bar andnormally out of engagement with said shaft, an air cylinder and pistonoperatively connected with said shaft, mechanisms for connecting theshaft at each side of the elevator car in operative engagement with saidtoothed wheel, a hoisting cable, and an electromagnet electricallyconnected with the hoisting cable of the elevator car and arranged whenenergized to hold said mechanisms out of operation and said toothedwheel out of operative engagement with said shaft.

2. In a safety apparatus for elevator oars, an elevator shaft, a rackbar extending from top to bottom of the shaft on each side thereof, anelevator car movable in said shaft, a hoisting cable connected to saidcar, a crank shaft extending across said car, a sleeve revoluble on saidcrank shaft at each end thereof, a gear carried by said sleeve, a clutchmember carried by the sleeve, a second sleeve splined upon said shaft ateach end thereof, a clutch member splined upon the second sleeve andadapted to engage the first mentioned clutch member at each end of theshaft, means normally holding the second clutch members out ofengagement with the first clutch members, releasing devices for thelast-mentioned means, springs constantly urging said releasing devicesinto operation, an electric circuit including the hoisting cable, and anelectromagnet in said circuit and arranged to hold the releasing devicesout of action.

In testimony whereof I hereunto affix my signature in presence of twowitnesses.

BERTHA 'BAUHER.

Vitnesses: V

ALBERT B. BEELAND, WM. J. FRANKLIN.

In testimony whereof I hereunto aflix my signature in presence of twowitnesses.

CLARENCE E. BAJUMER.

l/Vitnesses HELEN HAMILTON, CHAS. F. FAUs'r.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

